This revenue procedure will update Rev. Proc. 2016–13, 2016–4 I.R.B. 290, and identifies circumstances under which the disclosure on a taxpayer’s income tax return with respect to an item or position is adequate for the purpose of reducing the understatement of income tax under section 6662(d) of the Internal Revenue Code (relating to the substantial understatement aspect of the accuracy-related penalty), and for the purpose of avoiding the tax return preparer penalty under section 6694(a) (relating to understatements due to unreasonable positions) with respect to income tax returns.

This revenue procedure will apply to any income tax return filed on 2017 tax forms for a taxable year beginning in 2017, and to any income tax return filed in 2018 on 2017 tax forms for short taxable years beginning in 2018.

This revenue procedure updates Rev. Proc. 2016–13, 2016–4 I.R.B. 290, and identifies circumstances under which the disclosure on a taxpayer’s income tax return with respect to an item or position is adequate for the purpose of reducing the understatement of income tax under section 6662(d) of the Internal Revenue Code (relating to the substantial understatement aspect of the accuracy-related penalty), and for the purpose of avoiding the tax return preparer penalty under section 6694(a) (relating to understatements due to unreasonable positions) with respect to income tax returns. This revenue procedure does not apply with respect to any other penalty provisions (including but not limited to the disregard provisions of the section 6662(b)(1) accuracy-related penalty, the section 6662(b)(6) accuracy-related penalty and the section 6662(i) increased accuracy-related penalty in the case of nondisclosed noneconomic substance transactions, and the section 6662(j) increased accuracy-related penalty in the case of undisclosed foreign financial asset understatements). If this revenue procedure does not include an item, disclosure is adequate with respect to that item only if made on a properly completed Form 8275 or 8275–R, as appropriate, attached to the return for the year or to a qualified amended return. See Treas. Reg. § 1.6664–2(c) for information about qualified amended returns.

This revenue procedure applies to any income tax return filed on 2017 tax forms for a taxable year beginning in 2017, and to any income tax return filed in 2018 on 2017 tax forms for short taxable years beginning in 2018.

Editorial changes have been made throughout this revenue procedure. In addition, minor changes have been made in order to update the taxable years and tax forms to which this revenue procedure applies. No additional substantive changes have been made.

.01 If section 6662 applies to any portion of an underpayment of tax required to be shown on a return, an amount equal to 20 percent of the portion of the underpayment is added to the tax. The penalty rate increases to 40 percent in the case of gross valuation misstatements under section 6662(h), nondisclosed noneconomic substance transactions under section 6662(i), or undisclosed foreign financial asset understatements under section 6662(j). Section 6662(b)(2) applies to the portion of an underpayment of tax that is attributable to a substantial understatement of income tax.

.02 There is a substantial understatement of income tax if the amount of the understatement exceeds the greater of (i) 10 percent of the amount of tax required to be shown on the return for the taxable year or (ii) $5,000. Section 6662(d)(1). Section 6662(d)(1)(B) provides a special rule for corporations. A corporation (other than an S corporation or a personal holding company) has a substantial understatement of income tax if the amount of the understatement exceeds the lesser of (i) 10 percent of the tax required to be shown on the return for a taxable year (or, if greater, $10,000) or (ii) $10,000,000. An understatement is the excess of the amount of tax required to be shown on the return for the taxable year over the amount of the tax that is shown on the return reduced by any rebate. Section 6662(d)(2).

.03 In the case of an item not attributable to a tax shelter, if the taxpayer has a reasonable basis for the tax treatment of the item, the amount of the understatement is reduced by the portion of the understatement attributable to the item with respect to which the relevant facts affecting the item’s tax treatment are adequately disclosed in the return or in a statement attached to the return. Section 6662(d)(2)(B)(ii).

.04 Section 6694(a) imposes a penalty on a tax return preparer who prepares a return or claim for refund reflecting an understatement of liability due to an “unreasonable position” if the tax return preparer knew (or reasonably should have known) of the position. A position (other than a position with respect to a tax shelter or a reportable transaction to which section 6662A applies) is generally treated as unreasonable unless (i) there is or was substantial authority for the position, or (ii) the position was properly disclosed in accordance with section 6662(d)(2)(B)(ii)(I) and had a reasonable basis. If the position is with respect to a tax shelter (as defined in section 6662(d)(2)(C)(ii)) or a reportable transaction to which section 6662A applies, the position is treated as unreasonable unless it is reasonable to believe that the position would more likely than not be sustained on the merits. See Notice 2009–5, 2009–3 I.R.B. 309, for interim penalty compliance rules for tax shelter transactions.

.05 In general, this revenue procedure provides guidance for determining when disclosure by return is adequate for purposes of section 6662(d)(2)(B)(ii) and section 6694(a)(2)(B). For purposes of this revenue procedure, the taxpayer must furnish all required information in accordance with the applicable forms and instructions, and the money amounts entered on these forms must be verifiable.

.06 This revenue procedure may apply to a return for a fiscal tax year that begins in 2017 and ends in 2018. This revenue procedure may also apply to a short year return for a period beginning in 2018 if the return is to be filed before the 2018 forms are available. (Note that individuals are generally not put in this position. The most frequent situation in which a short year arises is when filing a decedent’s final return for a fractional part of a year. In that situation, the 2018 form will be available because the final return is due the fifteenth day of the fourth month following the close of the 12-month period that began with the first day of such fractional part of the year (meaning the due date is not accelerated). See Treas. Reg. § 1.6072–1(b).) In the case of fiscal year and short year returns, the taxpayer must take into account any tax law changes that are effective for tax years beginning after December 31, 2017, even though these changes are not reflected on the form or instructions.

.07 This document does not take into account the effect of tax law changes effective for tax years beginning after December 31, 2017. If a line referenced in this revenue procedure is affected by such a change and requires additional reporting, a taxpayer may have to file Form 8275, Disclosure Statement, or Form 8275–R, Regulation Disclosure Statement, until the Service prescribes criteria for complying with the requirement.

.08 A complete and accurate disclosure of a tax position on the appropriate year’s Schedule UTP, Uncertain Tax Position Statement, will be treated as if the corporation filed a Form 8275 or Form 8275–R regarding the tax position. The filing of a Form 8275 or Form 8275–R, however, will not be treated as if the corporation filed a Schedule UTP.

.01 General

(1) Additional disclosure of facts relevant to, or positions taken with respect to, issues involving any of the items set forth below is unnecessary for purposes of reducing any understatement of income tax under section 6662(d) (except as otherwise provided in section 4.02(3) concerning Schedules M-1 and M-3), provided that the forms and attachments are completed in a clear manner and in accordance with their instructions.

(2) The money amounts entered on the forms must be verifiable, and the information on the return must be disclosed in the manner described below. For purposes of this revenue procedure, a number is verifiable if, on audit, the taxpayer can prove the origin of the amount (even if that number is not ultimately accepted by the Internal Revenue Service) and the taxpayer can show good faith in entering that number on the applicable form.

(3) The disclosure of an amount as provided in section 4.02 below is not adequate when the understatement arises from a transaction between parties who are related within the meaning of section 267(b). If an entry may present a legal issue or controversy because of a related-party transaction, then that transaction and the relationship must be disclosed on a Form 8275 or Form 8275–R.

(4) When the amount of an item is shown on a line that does not have a preprinted description identifying that item (such as on an unnamed line under an “Other Expense” category), the taxpayer must clearly identify the item by including the description on that line. For example, to disclose a bad debt for a sole proprietorship, the words “bad debt” must be written or typed on the line of Schedule C that shows the amount of the bad debt. Also, for Schedule M-3 (Form 1120), Part II, line 25, Other income (loss) items with differences, or Part III, line 37, Other expense/deduction items with differences, the entry must provide descriptive language; for example, "Cost of non-compete agreement deductible not capitalizable,” and the description must be provided on an attachment. Similarly, for other forms, if space limitations on a form do not allow for an adequate description, the description must be continued on an attachment.

(5) Although a taxpayer may literally meet the disclosure requirements of this revenue procedure, the disclosure will have no effect for purposes of the section 6662 accuracy-related penalty if the item or position on the return: (1) does not have a reasonable basis as defined in Treas. Reg. § 1.6662–3(b)(3); (2) is attributable to a tax shelter item as defined in section 6662(d)(2)(C)(ii); or (3) is not properly substantiated or the taxpayer failed to keep adequate books and records with respect to the item or position.

(6) Disclosure also will have no effect for purposes of the section 6694(a) penalty as applicable to tax return preparers if the position is with respect to a tax shelter (as defined in section 6662(d)(2)(C)(ii)) or a reportable transaction to which section 6662A applies.

.02 Items

(1) Form 1040, Schedule A, Itemized Deductions:

(a) Medical and Dental Expenses: Complete lines 1 through 4, supplying all required information.

(b) Taxes: Complete lines 5 through 9, supplying all required information. Line 8 must list each type of tax and the amount paid.

(c) Interest Expenses: Complete lines 10 through 15, supplying all required information. This section 4.02(1)(c) does not apply to (i) amounts disallowed under section 163(d) unless Form 4952, Investment Interest Expense Deduction, is completed, or (ii) amounts disallowed under section 265.

(d) Contributions: Complete lines 16 through 19, supplying all required information and attaching all related forms required pursuant to statute or regulation.

(e) Casualty and Theft Losses: Complete Form 4684, Casualties and Thefts, and attach to the return. Each item or article for which a casualty or theft loss is claimed must be listed on Form 4684.

(2) Certain Trade or Business Expenses (including, for purposes of this section, the following six expenses as they relate to the rental of property):

(a) Casualty and Theft Losses: The procedure outlined in section 4.02(1)(e) must be followed.

(b) Legal Expenses: The amount claimed must be stated. This section does not apply, however, to amounts properly characterized as capital expenditures, personal expenses, or non-deductible lobbying or political expenditures, including amounts that are required to be (or that are) amortized over a period of years.

(c) Specific Bad Debt Charge-off: The amount written off must be stated.

(d) Officers’ Compensation: Complete Form 1125–E, Compensation of Officers, when its instructions require. You must express the “percent of time devoted to business” as a numerical percentage, rather than as a non-numerical description such as “part” or “as needed.” This section does not apply to “excess parachute payments,” payments, as defined in section 280G. This section does not apply to the extent that remuneration paid or incurred exceeds an applicable employee-remuneration deduction limitation under section 162(m).

(e) Repair Expenses: The amount claimed must be stated. This section does not apply, however, to any amount properly characterized as capital expenditures or personal expenses.

(f) Taxes (other than foreign taxes): The amount claimed must be stated.

(3) Differences in book and income tax reporting:

For Schedule M-1 and all Schedules M-3, including those listed in (a)-(f) below, the information provided must reasonably apprise the Service of the potential controversy concerning the tax treatment of the item. If the information provided does not so apprise the Service, a Form 8275 or Form 8275–R must be used to adequately disclose the item (see Part II of the instructions for those forms).

Note: An item reported on a line with a pre-printed description, shown on an attached schedule or “itemized” on Schedule M-1, may represent the aggregate amount of several transactions producing that item (i.e., a group of similar items, such as amounts paid or incurred for supplies by a taxpayer engaged in business). In some instances, a potentially controversial item may involve a portion of the aggregate amount disclosed on the schedule. The Service will not be reasonably apprised of a potential controversy by the aggregate amount disclosed. In these instances, the taxpayer must use Form 8275 or Form 8275–R regarding that portion of the item.

Combining unlike items, whether on Schedule M-1 or Schedule M-3 (or on an attachment when directed by the instructions), will not constitute an adequate disclosure.

Additionally, taxpayers that file the Schedule M-3 (Form 1120), Net Income (Loss) Reconciliation for Corporations With Total Assets of $10 Million or More, may be required to complete Schedule B (Form 1120), Additional Information for Schedule M-3 Filers. For further information see Who Must File in the General Instructions for Schedule B (Form 1120). Taxpayers that file the Schedule M-3 (Form 1065), Net Income (Loss) Reconciliation for Certain Partnerships, may be required to complete Schedule C (Form 1065), Additional Information for Schedule M-3 Filers. For further information see Who Must File in the General Instructions for Schedule C (Form 1065). When required, these schedules are necessary to constitute adequate disclosure:

(a) Form 1065. Schedule M-3 (Form 1065), Net Income (Loss) Reconciliation for Certain Partnerships: Column (a), Income (Loss) per Income Statement, of Part II (reconciliation of income (loss) items) and Column (a), Expense per Income Statement, of Part III (reconciliation of expense/deduction items); Column (b), Temporary Difference, and Column (c), Permanent Difference, of Part II (reconciliation of income (loss) items) and Part III (reconciliation of expense/deduction items); and Column (d), Income (Loss) per Tax Return, of Part II (reconciliation of income (loss) items) and Column (d), Deduction per Tax Return, of Part III (reconciliation of expense/deduction items).

(b) Form 1120. (i) Schedule M-1, Reconciliation of Income (Loss) per Books With Income per Return.

(ii) Schedule M-3 (Form 1120), Net Income (Loss) Reconciliation for Corporations With Total Assets of $10 Million or More: Column (a), Income (Loss) per Income Statement, of Part II (reconciliation of income (loss) items) and Column (a), Expense per Income Statement, of Part III (reconciliation of expense/deduction items); Column (b), Temporary Difference, and Column (c), Permanent Difference, of Part II (reconciliation of income (loss) items) and Part III (reconciliation of expense/deduction items); and Column (d), Income (Loss) per Tax Return, of Part II (reconciliation of income (loss) items) and Column (d), Deduction per Tax Return, of Part III (reconciliation of expense/deduction items).

(c) Form 1120–L. Schedule M-3 (Form 1120–L), Net Income (Loss) Reconciliation for U.S. Life Insurance Companies With Total Assets of $10 Million or More: Column (a), Income (Loss) per Income Statement, of Part II (reconciliation of income (loss) items) and Column (a), Expense per Income Statement, of Part III (reconciliation of expense/deduction items); Column (b), Temporary Difference, and Column (c), Permanent Difference, of Part II (reconciliation of income (loss) items) and Part III (reconciliation of expense/deduction items); and Column (d), Income (Loss) per Tax Return, of Part II (reconciliation of income (loss) items) and Column (d), Deduction per Tax Return, of Part III (reconciliation of expense/deduction items).

(d) Form 1120–PC. Schedule M-3 (Form 1120–PC), Net Income (Loss) Reconciliation for U.S. Property and Casualty Insurance Companies With Total Assets of $10 Million or More: Column (a), Income (Loss) per Income Statement, of Part II (reconciliation of income (loss) items) and Column (a), Expense per Income Statement, of Part III (reconciliation of expense/deduction items); Column (b), Temporary Difference, and Column (c), Permanent Difference, of Part II (reconciliation of income (loss) items) and Part III (reconciliation of expense/deduction items); and Column (d), Income (Loss) per Tax Return, of Part II (reconciliation of income (loss) items) and Column (d), Deduction per Tax Return, of Part III (reconciliation of expense/deduction items).

(e) Form 1120–S. Schedule M-3 (Form 1120–S), Net Income (Loss) Reconciliation for S Corporations With Total Assets of $10 Million or More: Column (a), Income (Loss) per Income Statement, of Part II (reconciliation of income (loss) items) and Column (a), Expense per Income Statement, of Part III (reconciliation of expense/deduction items); Column (b), Temporary Difference, and Column (c), Permanent Difference, of Part II (reconciliation of income (loss) items) and Part III (reconciliation of expense/deduction items); and Column (d), Income (Loss) per Tax Return, of Part II (reconciliation of income (loss) items) and Column (d), Deduction per Tax Return, of Part III (reconciliation of expense/deduction items).

(f) Form 1120–F. Schedule M-3 (Form 1120–F), Net Income (Loss) Reconciliation for Foreign Corporations With Reportable Assets of $10 Million or More: Column (b), Temporary Differences, Column (c), Permanent Differences, and Column (d), Other Permanent Differences for Allocations to Non-ECI and ECI, of Part II (reconciliation of income (loss) items) and Part III (reconciliation of expense/deduction items).

(4) Foreign Tax Items:

(a) International Boycott Transactions: Transactions disclosed on Form 5713, International Boycott Report; Schedule A, International Boycott Factor (Section 999(c)(1)); Schedule B, Specifically Attributable Taxes and Income (Section 999(c)(2)); and Schedule C, Tax Effect of the International Boycott Provisions, must be completed when required by their instructions.

(b) Treaty-Based Return Position: Transactions and amounts under section 6114 or section 7701(b) as disclosed on Form 8833, Treaty-Based Return Position Disclosure Under Section 6114 or 7701(b), must be completed when required by its instructions.

(5) Other:

(a) Moving Expenses: Complete Form 3903, Moving Expenses, and attach to the return.

(b) Employee Business Expenses: Complete Form 2106, Employee Business Expenses, or Form 2106–EZ, Unreimbursed Employee Business Expenses, and attach to the return. This section does not apply to club dues or to travel expenses for any non-employee accompanying the taxpayer on the trip.

(c) Fuels Credit: Complete Form 4136, Credit for Federal Tax Paid on Fuels, and attach to the return.

(d) Investment Credit: Complete Form 3468, Investment Credit, and attach to the return.

This revenue procedure applies to any income tax return filed on a 2017 tax form for a taxable year beginning in 2017 and to any income tax return filed on a 2017 tax form in 2018 for a short taxable year beginning in 2018.

The principal author of this revenue procedure is Casey R. Conrad of the Office of Associate Chief Counsel (Procedure & Administration). For further information regarding this revenue procedure, contact Branch 2 of Procedure and Administration at (202) 317-6844 (not a toll-free number).